Diamond abrasive cut-off wheel

ABSTRACT

A segmented diamond abrasive cutting member comprising a central support and drive disk and cutting segments spaced along the periphery of the disk, together with wear resistant portions projecting laterally from the sides of the disk adjacent the periphery thereof, for retaining therebetween slurry resulting from the cutting operation, thus preventing relative movement between the retained slurry and the disk during rotation of the disk, and thereby preventing erosive undercutting of the disk which in the past has led to separation of the cutting segments from attachment to the disk.

United States Patent [191 Schwarzkopf et a1.

[ DIAMOND ABRASIVE CUT-OFF WHEEL [75] Inventors: Henry Schwarzkopf, Pelham Manor; John J. Bouvier, Buchanan, both of NY. [73] Assignee: Ferro Corporation, Cleveland, Ohio [22] Filed: May 15, 1972 A [21] Appl. No.: 253,060

[52] US. Cl. 511/2064 [51] Int. Cl B24d 5/06 [58] Field of Search 51/204, 206 R, 206 P, 51/206.4, 206.5, 209 R [56] References Cited UNITED STATES PATENTS 3,128,755 4/1964 Benson 51/206 R X 3,517,463 6/1970 Niemiec 51/206.4 3,338,230 8/1967 Lindblad.... 51/206.4 X 3,363,617 1/1968 Hoerer 51/206 R X 3,122,030 2/1964 Metzger 51/206 R X FOREIGN PATENTS 0R APPLICATIONS 633,633 10/1927 France 51/206 F Oct. 9, 1973 11/1929 Norway 51/206 P 8/1903 Sweden 51/206 P Primary Examiner-Donald G. Kelly Attorney-Milton L. Simmons [5 7 ABSTRACT A segmented diamond abrasive cutting member comprising a central support and drive disk and cutting segments spaced along the periphery of the disk, together with wear resistant portions projecting laterally from the sides of the disk adjacent the periphery thereof, for retaining therebetween slurry resulting from the cutting operation, thus preventing relative movement between the retained slurry and the disk during rotation of the disk, and thereby preventing erosive undercutting of the disk which in the past has led to separation of the cutting segments from attachment to the disk.

6 Claims, 5 Drawing Figures venting relative movement thereof with respect to the disk.

BACKGROUND OF THE INVENTION Segmented diamond abrasive cut-off'wheels or members are well known in the prior art as exemplified, for instance, by US. Pat. Nos. 2,818,850, 3,203,774 and 3,590,535. Such type of cutting member is used, for instance, in cuttingconcrete, marble, tile, and the like. However, during use of such cutting members it has been found that the slurry produced by the coolant dur-\ ing the cutting operation on the selected material, such as, for instance, concrete or the like, wears at a relatively high rate on the supporting and drive disk, thereby undercutting or eroding the disk especially in the vicinity of the attachment of the cutting segments, and resulting in the cutting segments being separated from their attachment to the disk.

In US. patent application Ser. No. 153,501, filed June 16, 1971, in the name of Henry Schwarzkopf et al and entitled Diamond Abrasive Cut-Off Wheel, there is'disclosed a cut-off member which includes cutting segments mounted on the periphery thereof, with the cutting segments having serrations on their cutting surfaces. Such serrations are disclosed as being generally linear in the plane of the supporting and drive disk or as transversely extending, generally normal to the plane of the disk.

SUMMARY OF THE INVENTION The present invention provides a diamond abrasive cut-off wheel or member which has a multiplicity of cutting segments attached to the periphery of the central supporting and drive disk, and which includes means projecting laterally of the disk for retaining vtherebetween slurry resulting or produced from a cutting operation utilizing the cutting member, which laterally projecting means substantially prevents relative movement between the retained slurry and the drive disk of the cutting member to greatly reduce erosive wearing of the disk by the slurry.

Accordingly, an object of the invention is to provide a novel cut-off wheel or cutting member.

Another object of the invention is to provide a novel cut-off wheel comprising a central supporting and drive disk of metal and having a multiplicity of cutting segments fixed about the periphery of the disk, and which includes means for retaining slurry resulting from the cutting operation wherein the cutting member is utilized, for aiding in preventing erosion of the disk due to the slurry.

A further object of the invention is to provide a novel cut-off wheel ofthe latter type wherein the means for retaining the slurry comprises laterally projecting wear resistant segments circumferentially spaced along the periphery of the disk and extending radially inwardly toward the axis of rotation of the wheel.

A still furtherobject of the invention is to provide a cutting member of the latter type wherein the slurry retaining segments are formed of a diamond support matrix having diamond particles therethroughout, V and wherein the retaining segments project laterally of both sides of the support and drive disk es sentially the same amount as the lateral projection of the cutting segments with respect to the plane of the corresponding side of the supporting and drive disk.

' Other objects and advantages of the invention will be apparent from the following description taken in conjunction with the accompanying drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevational view of a section of a cutoff wheel produced in accordance with the invention;

FIG. 2 is a sectional view taken generally along the plane of line 22 of FIG. 1 looking in the direction of the arrows;

FIG. 3 is an enlarged sectional view generally similar to FIG. 2 but diagrammatically illustrating the undercutting that occurs in prior art cutting members after a relatively short period of time of operation thereof, due to relative movement between the slurry and the support and drive disk;

' FIG. 4 is a side-elevational view of a section of .a cutoff wheel produced in accordance with the invention, and wherein the cutting segments thereof have linear serrations thereon running parallel to the plane of the supporting and drive disk;

FIG. 5 is a fragmentary, side-elevational view illustrating a modified arrangement of cut-off wheel.

DESCRIPTION OF PREFERRED EMBODIMENTS Referring new again to the drawings and particularly to FIGS. 1 and 2, there is illustrated at 10 a cutting member formed inaccordance with the invention, and comprising a supporting and drive disk 12 conventionally formed of metal such as steel, and having a multiplicity of cutting segments 14 spaced along the periphery of the supporting and drive disk 12, and being secured thereto as by means of brazing. The cutting segments 14 can be manufactured utilizing techniques known in the art, and in the embodiment illustrated in FIG. 1, have transverse serrations 16 formed along their outer convex surfaces. Preferably, the serrations 16 form an angle of 90 at their bases, although an angle of anywhere from to 1 10 provides improved results, as disclosed "in aforementioned pending U.S. Ser. No. 153,501. The cutting segments illustrated are of the type comprising an upper or outer diamond supporting matrix section 18 of known composition having diamond particles therethroughout, and lower or inner diamond free section 20 preferably formed of a softer more readily machinable metal for expeditious brazing to the arbored support and drive disk 12.

The serrations 16 of the cutting segments are formed so as to cause certain flat faces of the diamond dust or chips embedded in the matrix section 18 to be oriented generally parallel to one of the inclined faces of the ser rations 16 during formation of the cutting segments. Thus, a much greater percentage of relatively sharp angular points of the diamond dust or chips are oriented in such manner that the diamond points will be more FIG. l, in each of said slots is disposed a slug or segment 26 formed of a wear resistant material. The segments 26 are mounted in the respective slot 24 so as to be disposed adjacent the periphery of the support and drive disk 12 and extend widthwise laterally therefrom. As can be seen the segments 26 extend lengthwise radially with the lengthwise axis of each segment 26 being disposed in a radial plane passing through the axis of rotation of the cutting member 10. Preferably, slots 24 extend inwardly as at 28, of the inner end of the respective segment 26.

In the embodiment illustrated the segments 26 may be formed of the same materials as those of cutting segments 14, except that such laterally projecting segments 26, as illustrated, do not have any layer or section of relatively soft material associated therewith, and may be brazed, welded or otherwise suitably attached to the metal disk 12, and as at 30. It will be understood that while the cutting segments 14 illustratedare of a multi-layer structure for facilitating their attachment to the periphery of disk 12, that such cutting segments could be composed of a single matrix material, and with diamond dust or chips disposed throughout the segment.

Referring in particular to FIG. 2, it will be seen that the width of the slug or segment 26 is substantially the same as the width of the cutting segments 14, and is aligned therewith, so that there is no problem with interference of the segments 26 with the material being cut by the cutting member. As can be seen from FIGS. 1 and 2, each segment 26 commences substantially at the periphery of the disk 12 and extends lengthwise radially inwardly toward the axis of rotation of the disk a selected amount, which in the embodiments illustrated in FIGS. 1, 2 and 4 is a dimension Z which is preferably approximately half the dimension L (FIG. 1) of an associated cutting segment. It will be understood therefore that in the embodiments of FIGS. 1 and 4 22 approximately equals L.

During operation of the cutting member by rotation thereof and cutting into the material being cut, such as for instance, concrete, marble or the like, coolant is conventionally used which forms a slurry of the material as the cutting member slices into the article being cut. Slurry is retained between the laterally projecting abutments formed by the pairs of the segments 26, and thus, such retained slurry which contains diamond particles or dust is prevented from relative movement with respect to the rotary support and drive disk 12 during rotation thereof. This containing or immobilization of the slurry between pairs of segments 26 prevents erosive wear of the slurry on the metallic disk 12 adjacent the cutting segments 14, and prevents undercutting of the disk and resultant separation of the cutting segments from the disk. FIG. 3 illustrates the un dercutting condition on prior art cutting members wherein the cutting member does not include applicant's means for retaining slurry. As can be seen, substantial undercutting as at 32 of the disk 12 occurs after a relatively short period of time of use of the cutting member 10a.

Referring now to FIG. 4, there is shown an arbored cutting member 10' having cutting segments 14 fixed around the periphery thereof, and with the aforediscussed laterally projecting wear resistant segments 26 positioned intermediate the cutting segments. However, in this embodiment, the serrations 16' on the cutting segments extend linearly, generally parallel to the plane of the disk rather than transversely thereof as in the first described embodiment. It will be understood that while the cutting segments shown in FIGS. 1, 2 and 4 of the drawings are serrated on their exterior cutting surfaces, they could be provided with substantially smooth cutting surfaces as shown for instance in FIG. 5 and that after use, the wearing down of the matrix exposes the hard diamond particles to provide for efficiency in the cutting operation.

FIG. 5 illustrates a further embodiment of cutting member 10" wherein the cutting segments 16" as illustrated have diamond dust or chips disposed throughout the segments. The slurry retaining segments 26 rather than being disposed in slots 24 intermediate the cutting segments 16", are located in alternate slots 36 in the disk member 12". Slots 36 extend radially inwardly from the periphery of the disk 12" and receive an associated retainer segment 26 therein in secured relation, as by means of brazing, welding or any other suitable fastening arrangement. Segments 26' are preferably formed of wear resistant material, similarly to segments 26 and project laterally from the plane of at least one side of the mounting disk, but preferably project laterally from both sides of the disk 12".

In the arrangement illustrated, the retainer segments 26' extend radially from adjacent the periphery of the disk toward the axis of rotation thereof varying amounts, repeating in the embodiment illustrated, with every third retainer segment. Such a staggering" of the amount of radial extension of the retainer segments aids in preventing or reducing undercutting of the cutting segments 16" by not only retaining slurry between pairs of the segments 26", but also by causing more effective deflecting of slurry away from the area of attachment of the cutting segments 16" to the periphery of disk 12". The aforementioned expansion slots 24 in the disk may be filled with epoxy resin to prevent passage of slurry therethrough, to aid in preventing wear on the support disk due to slurry movement.

From the foregoing description and accompanying drawings, it will be seen that the invention provides a segmented diamond abrasive cutting member which includes spaced cutting segments along the periphery of the central support and drive disk, together with wear resistant abutment means disposed adjacent the periphery of the disk and projecting laterally therefrom, for immobilizing or retaining therebetween slurry resulting from a cutting operation, in order to prevent undercutting of the cutting segments and the wearing of the supporting and drive disk by relatively movable slurry.

The terms and expressions which have been used are used as terms of descirption and not of limitation, and there is no intention of the use of such terms and expressions of excluding any equivalents of any of the features shown or described, or portions thereof, and it is recognized that various modifications are possible within the scope of the invention claimed.

What is claimed is:

1. A circular, diamond abrasive, segmented, rotatable cutting member having a central supporting and drive disk, a multiplicity of cutting segments attached to said disk and spaced about the periphery thereof, and a multiplicity of wear-resistant segments circumferentially spaced intermediate cutting segments and extending laterally from a face of said disk for retainin g, between said wear-resistant segments, slurry resulting from the cutting operation in which said cutting member is utilized, and for reducing relative movement between said disk and retained slurry during cutting rotation of said cutting member.

2. A cutting member in accordance with claim 1 wherein said wear-resistant segments extend lengthwise generally radially relative to said disk, the length of said wear-resistant segments in a radial direction varying from segment to segment so that the latter terminate at varying distances from the periphery of said disk.

3. A cutting member in accordance with claim 1 wherein there is provided a radially extending slot in said disk intermediate cutting segments, with said wearresistant segments disposed in said slots.

4. A cutting member in accordance with claim 2 wherein said disk has generally radially extending slots formed therein commencing at the periphery of said disk in the area of the connection of said cutting segments to said disk, said slots having wear-resistant segments located therein and projecting laterally from the plane of the corresponding face of said disk, each wearresistant segment at one end thereof being generally juxtaposed to an associated one of said cutting seganother group of adjacent of said wear-resistant segments.

6. A cutting member in accordance with claim 4 wherein said disk has other generally radially extending slots formed therein each of which is disposed intermediate a pair of the first mentioned slots, and filler means in the second mentioned slots to prevent movement of slurry therethrough.

i k l 

1. A circular, diamond abrasive, segmented, rotatable cutting member having a central supporting and drive disk, a multiplicity of cutting segments attached to said disk and spaced about the periphery thereof, and a multiplicity of wear-resistant segments circumferentially spaced intermediate cutting segments and extending laterally from a face of said disk for retaining, between said wear-resistant segments, slurry resulting from the cutting operation in which said cutting member is utilized, and for reducing relative movement between said disk and retained slurry during cutting rotation of said cutting member.
 2. A cutting member in accordance with claim 1 wherein said wear-resistant segments extend lengthwise generally radially relative to said disk, the length of said wear-resistant segments in a radial direction varying from segment to segment so that the latter terminate at varying distances from the periphery of said disk.
 3. A cutting member in accordance with claim 1 wherein there is provided a radially extending slot in said disk intermediate cutting segments, with said wear-resistant segments disposed in said slots.
 4. A cutting member in accordance with claim 2 wherein said disk has generally radially extending slots formed therein commencing at the periphery of said disk in the area of the connection of said cutting segments to said disk, said slots having wear-resistant segments located therein and projecting laterally from the plane of the corresponding face of said disk, each wear-resistant segment at one end thereof being generally juxtaposed to an associated one of said cutting segments.
 5. A cutting member in accordance with claim 2 wherein the lengths of said wear-resistant segments progressively increase starting with one of said wear-resistant segments and progressing through a predetermined number of adjacent of said wear-resistant segments, after which the length pattern repeats itself for another group of adjacent of said wear-resistant segments.
 6. A cutting member in accordance with claim 4 wherein said disk has other generally radially extending slots formed therein each of which is disposed intermediate a pair of the first mentioned slots, and filler means in the second mentioned slots to prevent movement of slurry therethrough. 